Fuse plttg



B. l.. MOSS FUSE PLUG Mal-'ch 8, '1932.

Filed May 5l. 1930 Patented Mar. 8, 1932 I UNITED STATES PATENT OFFICE BENJAMIN L. MOSS, OF CHICAGO, ILLINOIS, ASSIGNOR TO LEOPOLD MOSS, OF

CHICAGO,

ILLIN 01S rusia PLUG Application led May 31,

The invention relates to fuse plugs, and particularly to multiple fuse plugs.

Fuse plug of this type comprise multiple fuse elements, each of which elements may be employed to replace one that has been burned out.

An object of the present invention is to provide a multiple fuse plug having means adapted to indicate if the fuse element in use is intact.

Another object of the invention is to provide a fuse plug and means numbering the several plug elements s that one may readily note how many of the fuse elements have been burned out.

Many other objects and advantages will appear as this description progresses, reference being had to the accompanying drawings, wherein:

Figure l is a side elevation of a multiple fuse plug which embodies the invention.

.F Fig. 2 is a section taken on line 2-2 of ig. l.

Fig. 3 is a plan view of the improved fuse l plug.

Fig. 4 is a plan view of the body portion or casing of the fuse plug.

Fig. 5 is a plan view of a transparent or translucent disk having numbers stamped thereon which identify the fuse elements associated therewith.

Fig. 6 is a perspective view of a carries the multiple fuse, and

Fig. 7 is a perspective view of the multiple fuse.

Referring to the drawings, wherein I have shown a preferred form of the invention, the reference character 10 designates, enerally,

plug which vthe body portion, or casing, of the use plug,

the body portion, or casing,

10 being formed from electrical insulation,

such as glass, porcelain, or the equivalent, for the purpose.

v As best shown in Figs. 2'and 3, the body' member, or casing, 10, is hollow to provide a chamber 11 into which a plug 12 projects, the

plug 12 being held in place by a cap member 13.` The cap member 13 is preferably'rigidly secured to the casing 10 in the manner illustrated in Fig. 2, but it will be readily understood that the cap member 13 may be detach- 1930. Serial No. 458,488.

ably secured to the casing 10, if it is so de sired.

Secured to the casing 10 is a metallic sleeve 15 which is threaded so that the fuse plug may be threaded into the usual socket to 65 make contact with the sleeve terminal (not shown) thereof. Projecting 4through the bottom wall of the casingv 10 is a central contact member 16 adapted to engage the central Contact (not shown) of the usual socket and 60 provided with a head 17 at its upper end which is engageable with a multiple fuse element 18 carried by the plug 12.

The multiple fuse element 18 is best shown in Fig. 7, and comprises a plurality of fuse 66 elements 19 preferably formed integral with a central cup portion 20, the cup portion 20 being engageable with the head 17. The plug 12 is provided with a plurality of longitudinally extending channels 21 which ac- 70 commodate the fuse elements 19. Each fuse element 19 is provided with a reduced portion 23 which determines the capacity of the element.

Secured to the inner surface of the me- 76 tallic sleeve 15 is a contact member 24 comprising an arcuate contact 25 adapted to snap into channels 21 to engage the upper ends of the fuse elements 19, the construction being such that when the fuse plug is inserted in the usual socket current will flow from the contact 16 through the cup portion 20, through one of the fuse elements 19, and thence through the contact member 24 to the metallic sleeve 15.

The cap member 13 is provided with a central aperture 27 and with anaperture 28 which is positioned so that when the plug 12 is rotated the channels 21 and the fuse elements 19 disposed thereon will pass beneath 00 it. A finger piece 29, preferably formed integral with the plug 12 projects through the aperture 27 and provides means whereby the plug may be rotated. Disposed between the upper surface of 95 the casing 10 and the inner surface of the cap member 13 is a disk 30 which has au aperture 31 fitting over the finger piece 29 and conforming yto the shape thereof so that it will rotate with the plug. The disk 30 is 10U made of translucent mica, or the equivalent,

for the purpose, and is preferably provided with indicia 33 to identify the fuse elements disposed in the channels 21. Thus, in this instance, six fuse elements 19 are provided and the numerals 1 to 6, inclusive, are stamped, or printed, upon the upper surface of the mica so that they will-be visible successively through the aperture 28 when the plug is rotated.

When all of the fuse elements are in place and the fuse plug is to be inserted inthe usual socket, the finger piece 29 is preferably manipulated to bring the numeral 1, stamped or printed on the disk 30, into registry with the aperture 28. When the element associated with the numeral 1 fails, the plug 12 is' rotated until the numeral 2 is in registry with the aperture '28, whereupon the fuse element 19 associated 'therewith will be engaged by the arcuate contact 25. Thereafter, each time a fuse element burns out the plug 2 is rotated to bring the next fuse element into engagement with the Contact 25 until all of the elements have been used. A new plug may then be inserted in the socket, or the fuse plug 12 may be replaced by a new plug having a new multiple fuse.. In the lat-ter case, the cap member 13 must be detachably secured to the casing 10.

The above construction is particularly advantageous as when one of the fuse elements burns out the gas evolved from the fused portion passes through the associated channel 21 and discolors the under surface of the disk 30 below the proper numeral. This will indicate to the observer that the fuse element associated with that numeral has been burned out and that the plug 12 must be rotated to bring the succeeding fuse element into registry with tile aperture 28. i

lVhile I have shown and* described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible, in view of the prior art. `What I claim as new, and desire to secure by Letters Patent, is:

1. A fuse plug comprising a casing having a plurality of contacts, a plug rotatable in said casing, an apertured cap member holding said plug in place in said casing, a multiple fuse carried by said plug and having a plurality of fuse elements 'successively engageable with said contacts, and ya translucent member constrained to rotate With said plug and traveling beneath the aperture in said cap member to indicate by its discoloration the positions -of fuse elements which have burned out.

affixed my signature, this 3d day of May,

BENJAMIN L, Moss 

